RIGHT USE OF LIME IN SOIL IMPROVEMENT 



verized material can be supplied him at a 

 lower price per ton. Much by-product in 

 the manufacture of coarse limestone for 

 other purposes contains a considerable per- 

 centage of material that would not pass 

 through a 60-, or 40-, or lo-mesh screen, but 

 it does contain a big percentage of imme- 

 diately available lime, and a more complete 

 pulverization of this by-product would add 

 greatly to its cost. 



It is quite possible that a ton of such stone 

 may be bought at a price that would cover 

 the value only of the fine portion, estimated 

 on the basis of the prevailing price of finely 

 ground material, the coarse material being 

 obtained without any cost at all. It is this 

 situation, or an approach to it, that leads 

 some authorities to become strenuous advo- 

 cates of the use of coarsely pulverized stone. 

 The advice is right for those who are in a 

 position to accept it. If the money avail- 

 able for liming an acre of land can buy all 

 the fine stone needed for the present and 

 some coarser stone mixed with it for later 

 use by the soil, the purchase is much more 

 rational than the investment of the same 

 amount of money in very fine stone that has 

 no admixture of coarser material. If the 



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